it's a large mass of garbage created by revelers which usually end up bobbing in the water throughout this long night. officials say almost a million are left behind after the festival each year in bangkok alone. >> translator: tides use the rivers to carry away all the bad things. as a result, there's always a large amount of garbage left over. >> reporter: to help stovm problem, state agencies are asking people to share a graton with family or friends or make them out of natural materials. another increasingly popular option is the use of biodegradable materials such as bread. >> translator: many people are choosing bread gratones nowadays. they are environmentally friendly and the fish love them. >> the more technologically sophisticated can celebrate the festival online. visitors to this website can choose their own krathong, then add their wish. they can launch their krathong on this visual site. >> any kind of real krathong will always affect the environment. the online version is cleaner and leaves nothing behind. >> reporter: but these innovations alone are not enough to reduc